Pssst: A certain operating system has a birthday coming up on Saturday. It may or may not want us to make a big fuss, but it’s a big one and–oh, let’s just say it: Microsoft shipped Windows 1.0 on November 20th, 1985. For its first five years, it wasn’t very popular. And then it pretty much took over the world.

As is our wont when major products mark major anniversaries, we’re celebrating by investigating Windows’ odder aspects. Benj Edwards has compiled a look at the first quarter century of Windows offshoots, obscurities, and ephemera. Betcha there’s a lot more to come, too.